[INFO] cloning repository https://github.com/ahouts/mbuffer
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ahouts/mbuffer" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fahouts%2Fmbuffer", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fahouts%2Fmbuffer'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e198c4cd8762a038dde0af1710f32f20a0986edf
[INFO] checking ahouts/mbuffer against try#55b3f428b4fac6790b1e8492e0b91ff2d80aec7c for pr-77035
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fahouts%2Fmbuffer" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ahouts/mbuffer on toolchain 55b3f428b4fac6790b1e8492e0b91ff2d80aec7c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+55b3f428b4fac6790b1e8492e0b91ff2d80aec7c" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ahouts/mbuffer
[INFO] finished tweaking git repo https://github.com/ahouts/mbuffer
[INFO] tweaked toml for git repo https://github.com/ahouts/mbuffer written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/ahouts/mbuffer already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+55b3f428b4fac6790b1e8492e0b91ff2d80aec7c" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+55b3f428b4fac6790b1e8492e0b91ff2d80aec7c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d598aa0aaacd5facc1098c233bd4595f1c8c1f1c993486eeafd3bc5cd10cb416
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "d598aa0aaacd5facc1098c233bd4595f1c8c1f1c993486eeafd3bc5cd10cb416", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d598aa0aaacd5facc1098c233bd4595f1c8c1f1c993486eeafd3bc5cd10cb416", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d598aa0aaacd5facc1098c233bd4595f1c8c1f1c993486eeafd3bc5cd10cb416", kill_on_drop: false }`
[INFO] [stdout] d598aa0aaacd5facc1098c233bd4595f1c8c1f1c993486eeafd3bc5cd10cb416
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+55b3f428b4fac6790b1e8492e0b91ff2d80aec7c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6321ceb2a9f3455a49b4b0d533f3fc761e3812ce6201faed301c2bc55d0e2f45
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "6321ceb2a9f3455a49b4b0d533f3fc761e3812ce6201faed301c2bc55d0e2f45", kill_on_drop: false }`
[INFO] [stderr]     Checking libc v0.2.42
[INFO] [stderr]     Checking bitflags v1.0.3
[INFO] [stderr]     Checking strsim v0.7.0
[INFO] [stderr]     Checking textwrap v0.10.0
[INFO] [stderr]     Checking atty v0.2.10
[INFO] [stderr]     Checking clap v2.32.0
[INFO] [stderr]     Checking mbuffer v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/buff/mod.rs:17:70
[INFO] [stdout]    |
[INFO] [stdout] 17 |     pub fn new(segment_length: usize, buffer_size: usize, mut r: Box<Read + Send>, mut w: Box<Write + Send>) -> Self {
[INFO] [stdout]    |                                                                      ^^^^^^^^^^^ help: use `dyn`: `dyn Read + Send`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/buff/mod.rs:17:95
[INFO] [stdout]    |
[INFO] [stdout] 17 |     pub fn new(segment_length: usize, buffer_size: usize, mut r: Box<Read + Send>, mut w: Box<Write + Send>) -> Self {
[INFO] [stdout]    |                                                                                               ^^^^^^^^^^^^ help: use `dyn`: `dyn Write + Send`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/buff/mod.rs:17:70
[INFO] [stdout]    |
[INFO] [stdout] 17 |     pub fn new(segment_length: usize, buffer_size: usize, mut r: Box<Read + Send>, mut w: Box<Write + Send>) -> Self {
[INFO] [stdout]    |                                                                      ^^^^^^^^^^^ help: use `dyn`: `dyn Read + Send`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/buff/mod.rs:17:95
[INFO] [stdout]    |
[INFO] [stdout] 17 |     pub fn new(segment_length: usize, buffer_size: usize, mut r: Box<Read + Send>, mut w: Box<Write + Send>) -> Self {
[INFO] [stdout]    |                                                                                               ^^^^^^^^^^^^ help: use `dyn`: `dyn Write + Send`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.61s
[INFO] running `Command { std: "docker" "inspect" "6321ceb2a9f3455a49b4b0d533f3fc761e3812ce6201faed301c2bc55d0e2f45", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6321ceb2a9f3455a49b4b0d533f3fc761e3812ce6201faed301c2bc55d0e2f45", kill_on_drop: false }`
[INFO] [stdout] 6321ceb2a9f3455a49b4b0d533f3fc761e3812ce6201faed301c2bc55d0e2f45